1 Thess 5:3 is not a prophesy.
The Watchtower liked to use that scripture because they like future prophesies to lead people.
First to have a prophesy, there must be a prophet to relay it. Paul was not a prophet. Paul was a historian and he was just comparing the history of Israel from the past to how it will again play out in the future.
The nations are not the ones declaring peace and security. I was the people that did that in the past because they had temporary peace such as when Babylon went against Jerusalem and when Rome destroyed Jerusalem. Any connection to the future would be about the wild beast attacking the harlot and then a break in the action and people would declare peace and then they both would be destroyed.